desc.c revision 3138213bc9a827a372ad9f8009ebcc5d8797ce2d 
1/*
2 * Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
3 * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
4 * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
5 * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. The name of the author may not be used to endorse or promote products
17 *    derived from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 *
30 *	$Id$
31 */
32
33#include "defs.h"
34
35#include <fcntl.h>
36#include <sys/file.h>
37#ifdef LINUX
38#include <inttypes.h>
39#endif
40#ifdef HAVE_SYS_EPOLL_H
41#include <sys/epoll.h>
42#endif
43#ifdef HAVE_LIBAIO_H
44#include <libaio.h>
45#endif
46
47#if HAVE_LONG_LONG_OFF_T
48/*
49 * Hacks for systems that have a long long off_t
50 */
51#define flock64	flock		/* Horrid hack */
52#define printflock printflock64	/* Horrider hack */
53#endif
54
55
56static const struct xlat fcntlcmds[] = {
57	{ F_DUPFD,	"F_DUPFD"	},
58	{ F_GETFD,	"F_GETFD"	},
59	{ F_SETFD,	"F_SETFD"	},
60	{ F_GETFL,	"F_GETFL"	},
61	{ F_SETFL,	"F_SETFL"	},
62	{ F_GETLK,	"F_GETLK"	},
63	{ F_SETLK,	"F_SETLK"	},
64	{ F_SETLKW,	"F_SETLKW"	},
65	{ F_GETOWN,	"F_GETOWN"	},
66	{ F_SETOWN,	"F_SETOWN"	},
67#ifdef F_RSETLK
68	{ F_RSETLK,	"F_RSETLK"	},
69#endif
70#ifdef F_RSETLKW
71	{ F_RSETLKW,	"F_RSETLKW"	},
72#endif
73#ifdef F_RGETLK
74	{ F_RGETLK,	"F_RGETLK"	},
75#endif
76#ifdef F_CNVT
77	{ F_CNVT,	"F_CNVT"	},
78#endif
79#ifdef F_SETSIG
80	{ F_SETSIG,	"F_SETSIG"	},
81#endif
82#ifdef F_GETSIG
83	{ F_GETSIG,	"F_GETSIG"	},
84#endif
85#ifdef F_CHKFL
86	{ F_CHKFL,	"F_CHKFL"	},
87#endif
88#ifdef F_DUP2FD
89	{ F_DUP2FD,	"F_DUP2FD"	},
90#endif
91#ifdef F_ALLOCSP
92	{ F_ALLOCSP,	"F_ALLOCSP"	},
93#endif
94#ifdef F_ISSTREAM
95	{ F_ISSTREAM,	"F_ISSTREAM"	},
96#endif
97#ifdef F_PRIV
98	{ F_PRIV,	"F_PRIV"	},
99#endif
100#ifdef F_NPRIV
101	{ F_NPRIV,	"F_NPRIV"	},
102#endif
103#ifdef F_QUOTACL
104	{ F_QUOTACL,	"F_QUOTACL"	},
105#endif
106#ifdef F_BLOCKS
107	{ F_BLOCKS,	"F_BLOCKS"	},
108#endif
109#ifdef F_BLKSIZE
110	{ F_BLKSIZE,	"F_BLKSIZE"	},
111#endif
112#ifdef F_GETOWN
113	{ F_GETOWN,	"F_GETOWN"	},
114#endif
115#ifdef F_SETOWN
116	{ F_SETOWN,	"F_SETOWN"	},
117#endif
118#ifdef F_REVOKE
119	{ F_REVOKE,	"F_REVOKE"	},
120#endif
121#ifdef F_SETLK
122	{ F_SETLK,	"F_SETLK"	},
123#endif
124#ifdef F_SETLKW
125	{ F_SETLKW,	"F_SETLKW"	},
126#endif
127#ifdef F_FREESP
128	{ F_FREESP,	"F_FREESP"	},
129#endif
130#ifdef F_GETLK
131	{ F_GETLK,	"F_GETLK"	},
132#endif
133#ifdef F_SETLK64
134	{ F_SETLK64,	"F_SETLK64"	},
135#endif
136#ifdef F_SETLKW64
137	{ F_SETLKW64,	"F_SETLKW64"	},
138#endif
139#ifdef F_FREESP64
140	{ F_FREESP64,	"F_FREESP64"	},
141#endif
142#ifdef F_GETLK64
143	{ F_GETLK64,	"F_GETLK64"	},
144#endif
145#ifdef F_SHARE
146	{ F_SHARE,	"F_SHARE"	},
147#endif
148#ifdef F_UNSHARE
149	{ F_UNSHARE,	"F_UNSHARE"	},
150#endif
151#ifdef F_SETLEASE
152	{ F_SETLEASE,	"F_SETLEASE"	},
153#endif
154#ifdef F_GETLEASE
155	{ F_GETLEASE,	"F_GETLEASE"	},
156#endif
157#ifdef F_NOTIFY
158	{ F_NOTIFY,	"F_NOTIFY"	},
159#endif
160#ifdef F_DUPFD_CLOEXEC
161	{ F_DUPFD_CLOEXEC,"F_DUPFD_CLOEXEC"},
162#endif
163	{ 0,		NULL		},
164};
165
166static const struct xlat fdflags[] = {
167#ifdef FD_CLOEXEC
168	{ FD_CLOEXEC,	"FD_CLOEXEC"	},
169#endif
170	{ 0,		NULL		},
171};
172
173#ifdef LOCK_SH
174
175static const struct xlat flockcmds[] = {
176	{ LOCK_SH,	"LOCK_SH"	},
177	{ LOCK_EX,	"LOCK_EX"	},
178	{ LOCK_NB,	"LOCK_NB"	},
179	{ LOCK_UN,	"LOCK_UN"	},
180	{ 0,		NULL		},
181};
182
183#endif /* LOCK_SH */
184
185static const struct xlat lockfcmds[] = {
186	{ F_RDLCK,	"F_RDLCK"	},
187	{ F_WRLCK,	"F_WRLCK"	},
188	{ F_UNLCK,	"F_UNLCK"	},
189#ifdef F_EXLCK
190	{ F_EXLCK,	"F_EXLCK"	},
191#endif
192#ifdef F_SHLCK
193	{ F_SHLCK,	"F_SHLCK"	},
194#endif
195	{ 0,		NULL		},
196};
197
198#ifdef F_NOTIFY
199static const struct xlat notifyflags[] = {
200#ifdef DN_ACCESS
201	{ DN_ACCESS,	"DN_ACCESS"	},
202#endif
203#ifdef DN_MODIFY
204	{ DN_MODIFY,	"DN_MODIFY"	},
205#endif
206#ifdef DN_CREATE
207	{ DN_CREATE,	"DN_CREATE"	},
208#endif
209#ifdef DN_DELETE
210	{ DN_DELETE,	"DN_DELETE"	},
211#endif
212#ifdef DN_RENAME
213	{ DN_RENAME,	"DN_RENAME"	},
214#endif
215#ifdef DN_ATTRIB
216	{ DN_ATTRIB,	"DN_ATTRIB"	},
217#endif
218#ifdef DN_MULTISHOT
219	{ DN_MULTISHOT,	"DN_MULTISHOT"	},
220#endif
221	{ 0,		NULL		},
222};
223#endif
224
225static const struct xlat whence[] = {
226	{ SEEK_SET,	"SEEK_SET"	},
227	{ SEEK_CUR,	"SEEK_CUR"	},
228	{ SEEK_END,	"SEEK_END"	},
229	{ 0,		NULL		},
230};
231
232#ifndef HAVE_LONG_LONG_OFF_T
233/* fcntl/lockf */
234static void
235printflock(struct tcb *tcp, long addr, int getlk)
236{
237	struct flock fl;
238
239#if SUPPORTED_PERSONALITIES > 1
240	if (personality_wordsize[current_personality] != sizeof(fl.l_start)) {
241		if (personality_wordsize[current_personality] == 4) {
242			/* 32-bit x86 app on x86_64 and similar cases */
243			struct {
244				short int l_type;
245				short int l_whence;
246				int32_t l_start; /* off_t */
247				int32_t l_len; /* off_t */
248				int32_t l_pid; /* pid_t */
249			} fl32;
250			if (umove(tcp, addr, &fl32) < 0) {
251				tprintf("{...}");
252				return;
253			}
254			fl.l_type = fl32.l_type;
255			fl.l_whence = fl32.l_whence;
256			fl.l_start = fl32.l_start;
257			fl.l_len = fl32.l_len;
258			fl.l_pid = fl32.l_pid;
259		} else {
260			/* let people know we have a problem here */
261			tprintf("{ <decode error: unsupported wordsize %d> }",
262				personality_wordsize[current_personality]);
263			return;
264		}
265	} else
266#endif
267	{
268		if (umove(tcp, addr, &fl) < 0) {
269			tprintf("{...}");
270			return;
271		}
272	}
273	tprintf("{type=");
274	printxval(lockfcmds, fl.l_type, "F_???");
275	tprintf(", whence=");
276	printxval(whence, fl.l_whence, "SEEK_???");
277	tprintf(", start=%ld, len=%ld", fl.l_start, fl.l_len);
278	if (getlk)
279		tprintf(", pid=%lu}", (unsigned long) fl.l_pid);
280	else
281		tprintf("}");
282}
283#endif
284
285#if _LFS64_LARGEFILE || HAVE_LONG_LONG_OFF_T
286/* fcntl/lockf */
287static void
288printflock64(struct tcb *tcp, long addr, int getlk)
289{
290	struct flock64 fl;
291
292	if (umove(tcp, addr, &fl) < 0) {
293		tprintf("{...}");
294		return;
295	}
296	tprintf("{type=");
297	printxval(lockfcmds, fl.l_type, "F_???");
298	tprintf(", whence=");
299	printxval(whence, fl.l_whence, "SEEK_???");
300	tprintf(", start=%lld, len=%lld", (long long) fl.l_start, (long long) fl.l_len);
301	if (getlk)
302		tprintf(", pid=%lu}", (unsigned long) fl.l_pid);
303	else
304		tprintf("}");
305}
306#endif
307
308int
309sys_fcntl(struct tcb *tcp)
310{
311	if (entering(tcp)) {
312		printfd(tcp, tcp->u_arg[0]);
313		tprintf(", ");
314		printxval(fcntlcmds, tcp->u_arg[1], "F_???");
315		switch (tcp->u_arg[1]) {
316		case F_SETFD:
317			tprintf(", ");
318			printflags(fdflags, tcp->u_arg[2], "FD_???");
319			break;
320		case F_SETOWN: case F_DUPFD:
321#ifdef F_DUPFD_CLOEXEC
322		case F_DUPFD_CLOEXEC:
323#endif
324			tprintf(", %ld", tcp->u_arg[2]);
325			break;
326		case F_SETFL:
327			tprintf(", ");
328			tprint_open_modes(tcp->u_arg[2]);
329			break;
330		case F_SETLK: case F_SETLKW:
331#ifdef F_FREESP
332		case F_FREESP:
333#endif
334			tprintf(", ");
335			printflock(tcp, tcp->u_arg[2], 0);
336			break;
337#if _LFS64_LARGEFILE
338#ifdef F_FREESP64
339		case F_FREESP64:
340#endif
341		/* Linux glibc defines SETLK64 as SETLK,
342		   even though the kernel has different values - as does Solaris. */
343#if defined(F_SETLK64) && F_SETLK64 + 0 != F_SETLK
344		case F_SETLK64:
345#endif
346#if defined(F_SETLKW64) && F_SETLKW64 + 0 != F_SETLKW
347		case F_SETLKW64:
348#endif
349			tprintf(", ");
350			printflock64(tcp, tcp->u_arg[2], 0);
351			break;
352#endif
353#ifdef F_NOTIFY
354		case F_NOTIFY:
355			tprintf(", ");
356			printflags(notifyflags, tcp->u_arg[2], "DN_???");
357			break;
358#endif
359#ifdef F_SETLEASE
360		case F_SETLEASE:
361			tprintf(", ");
362			printxval(lockfcmds, tcp->u_arg[2], "F_???");
363			break;
364#endif
365		}
366	}
367	else {
368		switch (tcp->u_arg[1]) {
369		case F_DUPFD:
370#ifdef F_DUPFD_CLOEXEC
371		case F_DUPFD_CLOEXEC:
372#endif
373		case F_SETFD: case F_SETFL:
374		case F_SETLK: case F_SETLKW:
375		case F_SETOWN: case F_GETOWN:
376#ifdef F_NOTIFY
377		case F_NOTIFY:
378#endif
379#ifdef F_SETLEASE
380		case F_SETLEASE:
381#endif
382			break;
383		case F_GETFD:
384			if (syserror(tcp) || tcp->u_rval == 0)
385				return 0;
386			tcp->auxstr = sprintflags("flags ", fdflags, tcp->u_rval);
387			return RVAL_HEX|RVAL_STR;
388		case F_GETFL:
389			if (syserror(tcp))
390				return 0;
391			tcp->auxstr = sprint_open_modes(tcp->u_rval);
392			return RVAL_HEX|RVAL_STR;
393		case F_GETLK:
394			tprintf(", ");
395			printflock(tcp, tcp->u_arg[2], 1);
396			break;
397#if _LFS64_LARGEFILE
398#if defined(F_GETLK64) && F_GETLK64+0!=F_GETLK
399		case F_GETLK64:
400#endif
401			tprintf(", ");
402			printflock64(tcp, tcp->u_arg[2], 1);
403			break;
404#endif
405#ifdef F_GETLEASE
406		case F_GETLEASE:
407			if (syserror(tcp))
408				return 0;
409			tcp->auxstr = xlookup(lockfcmds, tcp->u_rval);
410			return RVAL_HEX|RVAL_STR;
411#endif
412		default:
413			tprintf(", %#lx", tcp->u_arg[2]);
414			break;
415		}
416	}
417	return 0;
418}
419
420#ifdef LOCK_SH
421
422int
423sys_flock(struct tcb *tcp)
424{
425	if (entering(tcp)) {
426		printfd(tcp, tcp->u_arg[0]);
427		tprintf(", ");
428		printflags(flockcmds, tcp->u_arg[1], "LOCK_???");
429	}
430	return 0;
431}
432#endif /* LOCK_SH */
433
434int
435sys_close(struct tcb *tcp)
436{
437	if (entering(tcp)) {
438		printfd(tcp, tcp->u_arg[0]);
439	}
440	return 0;
441}
442
443int
444sys_dup(struct tcb *tcp)
445{
446	if (entering(tcp)) {
447		printfd(tcp, tcp->u_arg[0]);
448	}
449	return 0;
450}
451
452static int
453do_dup2(struct tcb *tcp, int flags_arg)
454{
455	if (entering(tcp)) {
456		printfd(tcp, tcp->u_arg[0]);
457		tprintf(", ");
458		printfd(tcp, tcp->u_arg[1]);
459		if (flags_arg >= 0) {
460			tprintf(", ");
461			printflags(open_mode_flags, tcp->u_arg[flags_arg], "O_???");
462		}
463	}
464	return 0;
465}
466
467int
468sys_dup2(struct tcb *tcp)
469{
470	return do_dup2(tcp, -1);
471}
472
473#ifdef LINUX
474int
475sys_dup3(struct tcb *tcp)
476{
477	return do_dup2(tcp, 2);
478}
479#endif
480
481#if defined(ALPHA) || defined(FREEBSD) || defined(SUNOS4)
482int
483sys_getdtablesize(struct tcb *tcp)
484{
485	return 0;
486}
487#endif /* ALPHA || FREEBSD || SUNOS4 */
488
489static int
490decode_select(struct tcb *tcp, long *args, enum bitness_t bitness)
491{
492	int i, j, nfds;
493	unsigned int fdsize = ((((args[0] + 7) / 8) + sizeof(long) - 1)
494			       & -sizeof(long));
495	fd_set *fds;
496	static char outstr[1024];
497	const char *sep;
498	long arg;
499
500	if (entering(tcp)) {
501		fds = (fd_set *) malloc(fdsize);
502		if (fds == NULL)
503			fprintf(stderr, "out of memory\n");
504		nfds = args[0];
505		tprintf("%d", nfds);
506		for (i = 0; i < 3; i++) {
507			arg = args[i+1];
508			if (arg == 0) {
509				tprintf(", NULL");
510				continue;
511			}
512			if (fds == NULL || !verbose(tcp)) {
513				tprintf(", %#lx", arg);
514				continue;
515			}
516			if (umoven(tcp, arg, fdsize, (char *) fds) < 0) {
517				tprintf(", [?]");
518				continue;
519			}
520			tprintf(", [");
521			for (j = 0, sep = ""; j < nfds; j++) {
522				if (FD_ISSET(j, fds)) {
523					tprintf("%s", sep);
524					printfd(tcp, j);
525					sep = " ";
526				}
527			}
528			tprintf("]");
529		}
530		free(fds);
531		tprintf(", ");
532		printtv_bitness(tcp, args[4], bitness, 0);
533	}
534	else
535	{
536		unsigned int cumlen = 0;
537		const char *sep = "";
538
539		if (syserror(tcp))
540			return 0;
541
542		if ((nfds = tcp->u_rval) == 0) {
543			tcp->auxstr = "Timeout";
544			return RVAL_STR;
545		}
546
547		fds = (fd_set *) malloc(fdsize);
548		if (fds == NULL)
549			fprintf(stderr, "out of memory\n");
550
551		outstr[0] = '\0';
552		for (i = 0; i < 3; i++) {
553			int first = 1;
554
555			tcp->auxstr = outstr;
556			arg = args[i+1];
557			if (fds == NULL || !arg ||
558			    umoven(tcp, arg, fdsize, (char *) fds) < 0)
559				continue;
560			for (j = 0; j < args[0]; j++) {
561				if (FD_ISSET(j, fds)) {
562					char str[11 + 3 * sizeof(int)];
563
564					if (first) {
565						sprintf(str, "%s%s [%u", sep,
566							i == 0 ? "in" :
567							i == 1 ? "out" :
568							"except", j);
569						first = 0;
570						sep = ", ";
571					}
572					else
573						sprintf(str, " %u", j);
574					cumlen += strlen(str);
575					if (cumlen < sizeof(outstr))
576						strcat(outstr, str);
577					nfds--;
578				}
579			}
580			if (cumlen)
581				strcat(outstr, "]");
582			if (nfds == 0)
583				break;
584		}
585		free(fds);
586#ifdef LINUX
587		/* This contains no useful information on SunOS.  */
588		if (args[4]) {
589			char str[128];
590
591			sprintf(str, "%sleft ", sep);
592			sprinttv(tcp, args[4], bitness, str + strlen(str));
593			if ((cumlen += strlen(str)) < sizeof(outstr))
594				strcat(outstr, str);
595		}
596#endif /* LINUX */
597		return RVAL_STR;
598	}
599	return 0;
600}
601
602#ifdef LINUX
603
604int
605sys_oldselect(struct tcb *tcp)
606{
607	long args[5];
608
609	if (umoven(tcp, tcp->u_arg[0], sizeof args, (char *) args) < 0) {
610		tprintf("[...]");
611		return 0;
612	}
613	return decode_select(tcp, args, BITNESS_CURRENT);
614}
615
616#ifdef ALPHA
617int
618sys_osf_select(struct tcb *tcp)
619{
620	long *args = tcp->u_arg;
621	return decode_select(tcp, args, BITNESS_32);
622}
623#endif
624
625static const struct xlat epollctls[] = {
626#ifdef EPOLL_CTL_ADD
627	{ EPOLL_CTL_ADD,	"EPOLL_CTL_ADD"	},
628#endif
629#ifdef EPOLL_CTL_MOD
630	{ EPOLL_CTL_MOD,	"EPOLL_CTL_MOD"	},
631#endif
632#ifdef EPOLL_CTL_DEL
633	{ EPOLL_CTL_DEL,	"EPOLL_CTL_DEL"	},
634#endif
635	{ 0,			NULL		}
636};
637
638static const struct xlat epollevents[] = {
639#ifdef EPOLLIN
640	{ EPOLLIN,	"EPOLLIN"	},
641#endif
642#ifdef EPOLLPRI
643	{ EPOLLPRI,	"EPOLLPRI"	},
644#endif
645#ifdef EPOLLOUT
646	{ EPOLLOUT,	"EPOLLOUT"	},
647#endif
648#ifdef EPOLLRDNORM
649	{ EPOLLRDNORM,	"EPOLLRDNORM"	},
650#endif
651#ifdef EPOLLRDBAND
652	{ EPOLLRDBAND,	"EPOLLRDBAND"	},
653#endif
654#ifdef EPOLLWRNORM
655	{ EPOLLWRNORM,	"EPOLLWRNORM"	},
656#endif
657#ifdef EPOLLWRBAND
658	{ EPOLLWRBAND,	"EPOLLWRBAND"	},
659#endif
660#ifdef EPOLLMSG
661	{ EPOLLMSG,	"EPOLLMSG"	},
662#endif
663#ifdef EPOLLERR
664	{ EPOLLERR,	"EPOLLERR"	},
665#endif
666#ifdef EPOLLHUP
667	{ EPOLLHUP,	"EPOLLHUP"	},
668#endif
669#ifdef EPOLLONESHOT
670	{ EPOLLONESHOT,	"EPOLLONESHOT"	},
671#endif
672#ifdef EPOLLET
673	{ EPOLLET,	"EPOLLET"	},
674#endif
675	{ 0,		NULL		}
676};
677
678int
679sys_epoll_create(struct tcb *tcp)
680{
681	if (entering(tcp))
682		tprintf("%ld", tcp->u_arg[0]);
683	return 0;
684}
685
686int
687sys_epoll_create1(struct tcb *tcp)
688{
689	if (entering(tcp))
690		printflags(open_mode_flags, tcp->u_arg[0], "O_???");
691	return 0;
692}
693
694#ifdef HAVE_SYS_EPOLL_H
695static void
696print_epoll_event(struct epoll_event *ev)
697{
698	tprintf("{");
699	printflags(epollevents, ev->events, "EPOLL???");
700	/* We cannot know what format the program uses, so print u32 and u64
701	   which will cover every value.  */
702	tprintf(", {u32=%" PRIu32 ", u64=%" PRIu64 "}}",
703		ev->data.u32, ev->data.u64);
704}
705#endif
706
707int
708sys_epoll_ctl(struct tcb *tcp)
709{
710	if (entering(tcp)) {
711		printfd(tcp, tcp->u_arg[0]);
712		tprintf(", ");
713		printxval(epollctls, tcp->u_arg[1], "EPOLL_CTL_???");
714		tprintf(", ");
715		printfd(tcp, tcp->u_arg[2]);
716		tprintf(", ");
717		if (tcp->u_arg[3] == 0)
718			tprintf("NULL");
719		else {
720#ifdef HAVE_SYS_EPOLL_H
721			struct epoll_event ev;
722			if (umove(tcp, tcp->u_arg[3], &ev) == 0)
723				print_epoll_event(&ev);
724			else
725#endif
726				tprintf("{...}");
727		}
728	}
729	return 0;
730}
731
732static void
733epoll_wait_common(struct tcb *tcp)
734{
735	if (entering(tcp)) {
736		printfd(tcp, tcp->u_arg[0]);
737		tprintf(", ");
738	} else {
739		if (syserror(tcp))
740			tprintf("%lx", tcp->u_arg[1]);
741		else if (tcp->u_rval == 0)
742			tprintf("{}");
743		else {
744#ifdef HAVE_SYS_EPOLL_H
745			struct epoll_event ev, *start, *cur, *end;
746			int failed = 0;
747
748			tprintf("{");
749			start = (struct epoll_event *) tcp->u_arg[1];
750			end = start + tcp->u_rval;
751			for (cur = start; cur < end; ++cur) {
752				if (cur > start)
753					tprintf(", ");
754				if (umove(tcp, (long) cur, &ev) == 0)
755					print_epoll_event(&ev);
756				else {
757					tprintf("?");
758					failed = 1;
759					break;
760				}
761			}
762			tprintf("}");
763			if (failed)
764				tprintf(" %#lx", (long) start);
765#else
766			tprintf("{...}");
767#endif
768		}
769		tprintf(", %ld, %ld", tcp->u_arg[2], tcp->u_arg[3]);
770	}
771}
772
773int
774sys_epoll_wait(struct tcb *tcp)
775{
776	epoll_wait_common(tcp);
777	return 0;
778}
779
780int
781sys_epoll_pwait(struct tcb *tcp)
782{
783	epoll_wait_common(tcp);
784	if (exiting(tcp)) {
785		tprintf(", ");
786		print_sigset(tcp, tcp->u_arg[4], 0);
787	}
788	return 0;
789}
790
791int
792sys_io_setup(struct tcb *tcp)
793{
794	if (entering(tcp))
795		tprintf("%ld, ", tcp->u_arg[0]);
796	else {
797		if (syserror(tcp))
798			tprintf("0x%0lx", tcp->u_arg[1]);
799		else {
800			unsigned long user_id;
801			if (umove(tcp, tcp->u_arg[1], &user_id) == 0)
802				tprintf("{%lu}", user_id);
803			else
804				tprintf("{...}");
805		}
806	}
807	return 0;
808}
809
810int
811sys_io_destroy(struct tcb *tcp)
812{
813	if (entering(tcp))
814		tprintf("%lu", tcp->u_arg[0]);
815	return 0;
816}
817
818int
819sys_io_submit(struct tcb *tcp)
820{
821	long nr;
822	if (entering(tcp)) {
823		tprintf("%lu, %ld, ", tcp->u_arg[0], tcp->u_arg[1]);
824		nr = tcp->u_arg[1];
825		/* and if nr is negative? */
826		if (nr == 0)
827			tprintf("{}");
828		else {
829#ifdef HAVE_LIBAIO_H
830			long i;
831			struct iocb *iocbp, **iocbs = (void *)tcp->u_arg[2];
832
833			for (i = 0; i < nr; i++, iocbs++) {
834				struct iocb iocb;
835				if (i == 0)
836					tprintf("{");
837				else
838					tprintf(", ");
839
840				if (umove(tcp, (unsigned long)iocbs, &iocbp) ||
841				    umove(tcp, (unsigned long)iocbp, &iocb)) {
842					tprintf("{...}");
843					continue;
844				}
845				tprintf("{%p, %u, %hu, %hu, %d}",
846					iocb.data, iocb.key,
847					iocb.aio_lio_opcode,
848					iocb.aio_reqprio, iocb.aio_fildes);
849			}
850			if (i)
851				tprintf("}");
852#else
853			tprintf("{...}");
854#endif
855		}
856	}
857	return 0;
858}
859
860int
861sys_io_cancel(struct tcb *tcp)
862{
863	if (entering(tcp)) {
864#ifdef HAVE_LIBAIO_H
865		struct iocb iocb;
866#endif
867		tprintf("%lu, ", tcp->u_arg[0]);
868#ifdef HAVE_LIBAIO_H
869		if (umove(tcp, tcp->u_arg[1], &iocb) == 0) {
870			tprintf("{%p, %u, %hu, %hu, %d}, ",
871				iocb.data, iocb.key,
872				iocb.aio_lio_opcode,
873				iocb.aio_reqprio, iocb.aio_fildes);
874		} else
875#endif
876			tprintf("{...}, ");
877	} else {
878		if (tcp->u_rval < 0)
879			tprintf("{...}");
880		else {
881#ifdef HAVE_LIBAIO_H
882			struct io_event event;
883			if (umove(tcp, tcp->u_arg[2], &event) == 0)
884				tprintf("{%p, %p, %ld, %ld}",
885					event.data, event.obj,
886					event.res, event.res2);
887			else
888#endif
889				tprintf("{...}");
890		}
891	}
892	return 0;
893}
894
895int
896sys_io_getevents(struct tcb *tcp)
897{
898	if (entering(tcp)) {
899		tprintf("%ld, %ld, %ld, ", tcp->u_arg[0], tcp->u_arg[1],
900			tcp->u_arg[2]);
901	} else {
902		if (tcp->u_rval == 0) {
903			tprintf("{}");
904		} else  {
905#ifdef HAVE_LIBAIO_H
906			struct io_event *events = (void *)tcp->u_arg[3];
907			long i, nr = tcp->u_rval;
908
909			for (i = 0; i < nr; i++, events++) {
910				struct io_event event;
911
912				if (i == 0)
913					tprintf("{");
914				else
915					tprintf(", ");
916
917				if (umove(tcp, (unsigned long)events, &event) != 0) {
918					tprintf("{...}");
919					continue;
920				}
921				tprintf("{%p, %p, %ld, %ld}", event.data,
922					event.obj, event.res, event.res2);
923			}
924			tprintf("}, ");
925#else
926				tprintf("{...}");
927#endif
928		}
929
930		print_timespec(tcp, tcp->u_arg[4]);
931	}
932	return 0;
933}
934#endif /* LINUX */
935
936int
937sys_select(struct tcb *tcp)
938{
939	return decode_select(tcp, tcp->u_arg, BITNESS_CURRENT);
940}
941
942#ifdef LINUX
943int
944sys_pselect6(struct tcb *tcp)
945{
946	int rc = decode_select(tcp, tcp->u_arg, BITNESS_CURRENT);
947	if (entering(tcp)) {
948		struct {
949			void *ss;
950			unsigned long len;
951		} data;
952		if (umove(tcp, tcp->u_arg[5], &data) < 0)
953			tprintf(", %#lx", tcp->u_arg[5]);
954		else {
955			tprintf(", {");
956			if (data.len < sizeof(long))
957				tprintf("%#lx", (long)data.ss);
958			else
959				print_sigset(tcp, (long)data.ss, 0);
960			tprintf(", %lu}", data.len);
961		}
962	}
963	return rc;
964}
965
966static int
967do_eventfd(struct tcb *tcp, int flags_arg)
968{
969	if (entering(tcp)) {
970		tprintf("%lu", tcp->u_arg[0]);
971		if (flags_arg >= 0) {
972			tprintf(", ");
973			printflags(open_mode_flags, tcp->u_arg[flags_arg], "O_???");
974		}
975	}
976	return 0;
977}
978
979int
980sys_eventfd(struct tcb *tcp)
981{
982	return do_eventfd(tcp, -1);
983}
984
985int
986sys_eventfd2(struct tcb *tcp)
987{
988	return do_eventfd(tcp, 1);
989}
990#endif
991